Four-waller

With their audience's desires carefully measured and films made to match those desires, four-wallers then saturated local television markets with advertisements for their movies […]

The sets and corridors were all built with very low ceilings. They were four-wallers, so that meant lighting through grills or hiding lights or having in-shot lamps. I think the look of the film is due to the nature of the sets […]

Now it is more common for studios to operate as 'four wallers', that is just the buildings with very limited supporting facilities and for all the personnel to be engaged by the production company.